Display panel

ABSTRACT

A display panel is disclosed, which comprises: a first substrate; a second substrate opposite to the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate; a shielding pattern disposed on the second substrate and comprising a first region and a second region, in which a transmittance of the first region is larger than that of the second region; and a first aggregation layer disposed on a side of the first substrate facing to the second substrate, wherein a roughness of the first aggregation layer corresponding to the first region of the shielding pattern is larger than that of the first aggregation layer corresponding to the second region thereof.

CROSS REFERENCE TO RELATED APPLICATION

This application claims the benefits of the Taiwan Patent ApplicationSerial Number 103115370, filed on Apr. 29, 2014, the subject matter ofwhich is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a display panel and, more particularly,to a display panel with aggregations having specific structures.

2. Description of Related Art

In recent years, all the display devices are developed toward havingsmall volume, thin thickness and light weight as the display techniquesprogresses. A liquid crystal display (LCD) device is a flat paneldisplay device with a thin thickness, so a conventional cathode ray tube(CRT) display is gradually replaced by the LCD. Especially, the LCD canbe applied to various fields. For example, the daily used devices suchas cell phones, notebooks, video cameras, cameras, music players,navigation devices, and televisions are equipped with liquid crystaldisplay (LCD) panels.

The brightness, the contrast, the color and the viewing angles are mainparameters related to the viewing effect of the LCD panels. As thedevelopments of the LCD devices, the main stream or developing LCDpanels can be divided into: twisted nematic (TN) mode, verticalalignment (VA) mode, and in-plane switching (IPS) mode.

For the VA mode LCD, the firstly developed multi-domain verticalalignment (MVA) technology is achieved by disposing protrusions on acolor filter substrate to keep liquid crystal molecules withpredetermined angles (also called as pre-tilt angles) in the staticstate. Hence, when a voltage is applied to the LCD, the liquid crystalmolecules can tilt more quickly. Meanwhile, the protrusions can changethe alignment of the liquid crystal molecules to achieve the purpose ofwide viewing angles. Except for the MVA technology, apolymer-stabilizing alignment (PSA) technology is also developed,wherein a polymer layer with microstructures is used to replace theprotrusions used in the MVA technology to achieve the purpose of wideviewing angles and rapid response. Hence, the VA mode LCD is currentlyused in the current high level LCD.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a display panel with anaggregation layer having specific structures for facilitating tilts ofliquid crystal molecules and alignments thereof to improve a responserate of a liquid crystal layer of the display panel.

Another object of the present invention is to provide a method formanufacturing a display panel with an aggregation layer having specificstructures.

To achieve the object, a method for manufacturing a display panel of thepresent invention comprising: providing a first substrate and a secondsubstrate opposite to the first substrate; forming a shielding patterncomprising an opening region and a shielding region on the secondsubstrate; injecting a liquid crystal material comprising liquid crystalmolecules and photosensitive monomers into a space between the firstsubstrate and the second substrate; and applying an irradiation from thesecond substrate to polymerize the photosensitive monomers to form anaggregation layer on at least one of the first substrate and the secondsubstrate. The obtained aggregation layer can be used with an alignmentlayer as a layer causing pre-tilt angles of the liquid crystalmolecules. In addition, during the polymerization process, a voltage maybe selectively applied onto different regions to make the liquid crystalmolecules have predetermined pre-tilt angles in advance.

In addition, one aspect of the present invention is to provide a displaypanel prepared with the aforementioned method, which comprises: a firstsubstrate; a second substrate opposite to the first substrate; a liquidcrystal layer disposed between the first substrate and the secondsubstrate; a shielding pattern disposed on the second substrate andcomprising a first region and a second region, in which a transmittanceof the first region is larger than that of the second region; and afirst aggregation layer disposed on a side of the first substrate facingto the second substrate, wherein a roughness of the first aggregationlayer corresponding to the first region of the shielding pattern islarger than that of the first aggregation layer corresponding to thesecond region thereof.

Herein, the transmittance of the first region and the second region isnot particularly limited, and the first aggregation layer havingdifferent roughness can be obtained as long as the transmittance of thefirst region is larger than that of the second region. In one case, thefirst region of the shielding pattern corresponds to an opening region,and the second region thereof corresponds to a shielding region.Preferably, the transmittance of the first region of the shieldingpattern is 30˜100%, or that of the second region thereof is 0˜20%.Herein, the term “aggregation layer” is a layer formed by pluralaggregations; and there may be holes or openings present betweenaggregations in the aggregation layer in some cases.

In the present aspect, preferably, the first region and the secondregion of the shielding pattern having different transmittances arerespectively an opening region and a shielding region. In this case, theroughness of the first aggregation layer corresponding to the openingregion of the shielding pattern is larger than that of the firstaggregation layer corresponding to the shielding region thereof.

In the display panel of the present aspect, the first aggregation layermay comprise a corresponding opening region and a correspondingshielding region, the corresponding opening region and the correspondingshielding region respectively correspond to the opening region (or thefirst region) and the shielding region (or the second region) of theshielding pattern, and a projection of the opening region (or the firstregion) of the shielding region is located in the corresponding openingregion of the first aggregation layer. Herein, a width of the openingregion of the shielding pattern is α, a width of the correspondingopening region of the first aggregation layer is β, a thickness of theliquid crystal layer is D, and α, β and D satisfy the following equation(I):0.0002α²+0.9888α+1.637D−4.2987<β<0.0002α²+0.9888α+1.637D+11.5657  (I).

In addition, another aspect of the present invention further provides adisplay panel prepared with the aforementioned method, which comprises:a first substrate; a second substrate opposite to the first substrate; aliquid crystal layer disposed between the first substrate and the secondsubstrate; a shielding pattern disposed on the second substrate andcomprising an opening region and a shielding region; and a correspondingopening region disposed on a side of the first substrate facing to thesecond substrate and corresponding to the opening region of theshielding pattern, wherein a projection of the opening region of thelight shielding layer is located in the corresponding opening region,and a first aggregation layer (or a first aggregation layer formed withplural first aggregations) is disposed therein. Herein, a width of theopening region of the shielding pattern is α, a width of thecorresponding opening region is β, a thickness of the liquid crystallayer is D, and α, β and D satisfy the aforementioned equation (I).

In the display panel of the present aspect, the corresponding openingregion preferably is a reflected pattern. More specifically, thecorresponding opening region is a reflected pattern obtained with areflection microscope, which is formed by the different reflections ofthe corresponding opening region and the other region (the correspondingshielding region) while light is irradiated thereon. In the presentaspect, a wavelength of the irradiated light is located in a visibleregion (380 nm˜780 nm). In addition, the display panel of the presentaspect may further comprise a corresponding shielding region disposed ona side of the second substrate facing to the first substrate andcorresponding to the shielding region of the shielding pattern, whereinthe first aggregation layer is disposed in the corresponding openingregion and the corresponding shielding region, a roughness of the firstaggregation layer disposed in the corresponding opening region is largerthan that of the first aggregation layer disposed in the correspondingshielding region.

In the display panels provided by all the aforementioned aspects of thepresent invention, the shielding pattern is a black matrix layer or apatterned metal layer such as circuits.

In addition, the display panels provided by all the aforementionedaspects of the present invention may further comprise a secondaggregation layer disposed on a side of the second substrate facing tothe first substrate, wherein a roughness of the second aggregation layercorresponding to the opening region (or the first region) of theshielding pattern is larger than that of the second aggregation layercorresponding to the shielding region (or the second region) thereof.

Furthermore, in the display panels provided by all the aforementionedaspects of the present invention, a roughness of the first aggregationlayer corresponding to the opening region (or the first region) of theshielding pattern is larger than that of the second aggregation layercorresponding to the opening region (or the first region) thereof;and/or a roughness of the first aggregation layer corresponding to theshielding region (or the second region) of the shielding pattern islarger than that of the second aggregation layer corresponding to theshielding region (or the second region) thereof. More specifically,during the process for preparing the display panel of the presentinvention, light is irradiated from the second substrate, so the firstsubstrate is considered as a far side and the second substrate isconsidered as a near side. Hence, the roughness of the first aggregationlayer corresponding to the opening region (or the first region)/theshielding region (or the second region) of the shielding pattern at thefar side is respectively larger than that of the second aggregationlayer corresponding thereto at the near side. However, for either thefirst aggregation layer at the far side or the second aggregation layerat the near side, the roughness of the first aggregation layer or thesecond aggregation layer corresponding to the opening region of theshielding pattern is larger than that of the first aggregation layer orthe second aggregation layer corresponding to the shielding regionthereof. Preferably, the roughness of the first aggregation layer or thesecond aggregation layer corresponding to the opening region of theshielding pattern is 5˜12 times of that of the first aggregation layeror the second aggregation layer corresponding to the shielding regionthereof.

In addition, in the display panels provided by all the aforementionedaspects of the present invention, the term “roughness” refers to RootMean Square (RMS) roughness (Rq), which is the RMS average between theheight deviations and the central line along a longitude of the sample.

Furthermore, in the display panels provided by all the aforementionedaspects of the present invention, the first aggregation layer comprisesa corresponding opening region and a corresponding shielding region, andthe corresponding opening region and the corresponding shielding regionrespectively correspond to the opening region (or the first region) andthe shielding region (or the second region) of the shielding pattern. Anaverage height between a surface of the corresponding opening region (orthe central line along a longitude thereof) and a surface of a firstalignment layer on the first substrate is at least 15 nm, preferably15˜100 nm, and more preferably 20˜50 nm.

Other objects, advantages, and novel features of the invention willbecome more apparent from the following detailed description when takenin conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B are cross-sectional views of liquid crystal displaypanels according to one preferred embodiment of the present invention;

FIG. 2 is a perspective view showing a part of a first substrate andthin film transistors disposed thereon in a liquid crystal display panelaccording to one preferred embodiment of the present invention;

FIG. 3 is a perspective view showing a part of a second substrate and ablack matrix layer disposed thereon in a liquid crystal display panelaccording to one preferred embodiment of the present invention;

FIG. 4 is a perspective view showing a pattern of a second aggregationlayer in a liquid crystal display panel according to one preferredembodiment of the present invention;

FIG. 5 is a perspective view showing a pattern of a first aggregationlayer in a liquid crystal display panel according to one preferredembodiment of the present invention;

FIG. 6 is a perspective view showing a first aggregation layer and ablack matrix layer in a non-display region of a liquid crystal displaypanel according to another preferred embodiment of the presentinvention;

FIG. 7 is a perspective view showing a first aggregation layer and ablack matrix layer in a non-display region of a liquid crystal displaypanel according to another preferred embodiment of the presentinvention; and

FIGS. 8 to 10 are enlarged views of a first aggregation layer in liquidcrystal display panels according to other preferred embodiments of thepresent invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention has been described in an illustrative manner, andit is to be understood that the terminology used is intended to be inthe nature of description rather than of limitation. Many modificationsand variations of the present invention are possible in light of theabove teachings. Therefore, it is to be understood that within the scopeof the appended claims, the invention may be practiced otherwise than asspecifically described.

FIG. 1A is a cross-sectional view of a liquid crystal display panel ofthe present embodiment.

As shown in FIG. 1A, a first substrate 11 and a second substrate 21 areprovided, wherein a thin film transistor layer 12 and a color filterlayer 22 are sequentially formed on the first substrate 11 to obtain acolor filter on array (COA) display panel. In addition, a black matrixlayer 221 is formed on the second substrate 21 as a light shieldingpattern. Herein, the first substrate 11 and the second substrate 21 canbe any substrate generally used in the art, such as plastic substratesor glass substrates.

In other embodiment of the present embodiment, as shown in FIG. 1B, thethin film transistor layer 12 and the color filter layer 22 arerespectively formed on the first substrate 11 and the second substrate21, wherein the thin film transistor layer 12 is opposite to the colorfilter layer 22, the black matrix layer 221 as a light shielding patternis formed on the color filter layer 22.

Hereinafter, the liquid crystal display panel of FIG. 1A is described indetail.

FIG. 2 is a perspective view showing a part of a first substrate andthin film transistors disposed thereon in the liquid crystal displaypanel of the present embodiment. The thin film transistor layer formedon the first substrate 11 comprises: scan lines 121, data lines 122, athin film transistor unit 123, a pixel electrode 124 and a capacitorelectrode 125. Herein, two adjacent scan lines 121 and two adjacent datalines 122 define a pixel unit. One pixel unit comprises: one thin filmtransistor unit 123, one pixel electrode 124 and one capacitor electrode125, and the pixel electrode 124 is located between two adjacent scanlines 121 and two adjacent data lines 122. Herein, the scan lines 121,the data lines 122 and the capacitor electrode 125 can be made with anyconductive material generally used in the art, such as metal, alloy,metal oxide, metal oxynitrides, or other electrode materials used in theart; and preferably metal. The pixel electrode 124 can be made with anytransparent conductive material generally used in the art, for example,transparent conductive oxides such as ITO, IZO or a combination thereof(for example, a composite material of ITO and IZO). In otherembodiments, the location of the capacitor electrode 125 is not limitedto that shown in FIG. 2, and can be adjusted if necessary.

FIG. 3 is a perspective view showing a part of a second substrate and ablack matrix layer disposed thereon in the liquid crystal display panelof the present embodiment. Herein, the black matrix 211 formed on thesecond substrate 21 comprises: opening regions 2211 and a shieldingregion 2212 disposed between the opening regions 2211. In addition, thesecond substrate 21 may further comprise a display region A and anon-display region B.

As shown in FIG. 1A, a first alignment layer 13 and a second alignmentlayer 23 formed with polyimide are respectively formed on the firstsubstrate 11 and the second substrate 21, followed by injecting a liquidcrystal material into a space between the first substrate 11 and thesecond substrate 21 to form a liquid crystal layer 31. Herein, theliquid crystal material comprises: liquid crystal molecules andphotosensitive monomer. The liquid crystal material can be injected intothe space between the first substrate 11 and the second substrate 21through any known manner used in the art, such as a drop-type injectionprocess or an injection method using a capillary effect. In addition,the liquid crystal material may further comprise a photo-initiator tofacilitate the polymerization of the photosensitive monomers. In thepresent embodiment, the photosensitive monomers and the photo-initiatorare not particularly limited, and can be any compounds generally used inthe art for forming the alignment layer.

Then, as shown in FIG. 1A, an energy is applied onto the display panelto polymerize the photosensitive monomers to form a first aggregationlayer 14 and a second aggregation layer 24, which are respectivelyformed on the first substrate 11 and the second substrate. Both theformed first aggregation layer 14 and the formed second aggregationlayer 24 have the property of causing the pre-tilt angles of the liquidcrystal molecules. More specifically, the photosensitive monomers arepolymerized through an irradiation such as UV light to formaggregations, wherein the first aggregation layer 14 is composed ofplural first aggregations formed on the first substrate 11, and thesecond aggregation layer 14 is composed of plural second aggregationsformed on the second substrate 21. Since the first aggregation layer 14and the second aggregation layer 24 are respectively composed of pluralfirst aggregations and plural second aggregations, there may be holes oropenings formed between the first or second aggregations.

In addition, as shown in FIG. 1A, during the polymerization process, noadditional voltage is applied to the non-display region B, so animproved vertical alignment of the liquid crystal molecules in thenon-display region B can be achieved. Thus, the liquid crystal moleculesin the non-display region B can recover more quickly when an externalvoltage is applied onto the liquid crystal panel. Furthermore, duringthe polymerization process, an additional voltage is applied to thedisplay region A to make the liquid crystal molecules in the liquidcrystal layer 31 tilt in a predetermined angle. After the photosensitivemonomers are polymerized to obtain the first aggregation layer formedwith plural first aggregations and the second aggregation layer formedwith plural second aggregations having specific structures, the specificstructures can fix the pre-tilt angles of the liquid crystal moleculesin the display region A. Thus, the liquid crystal molecules can betilted rapidly to exchange the bright state and the dark state of thedisplay panel quickly.

Hereinafter, the structures of the first aggregation layer and thesecond aggregation layer in the liquid crystal display panel of thepresent embodiment are described in detail.

As shown in FIG. 1A, the first aggregation layer 14 and the secondaggregation layer 24 of the present embodiment are formed with theaggregations, which are obtained by polymerizing the photosensitivemonomers through the irradiation such as UV light. Herein, theirradiation can be applied from the first substrate 11 or the secondsubstrate 12. For example, in the display panel shown in FIG. 1A, theirradiation is preferably applied from the second substrate 21; and inthe display panel shown in FIG. 1B, the irradiation is preferablyapplied from the first substrate 11. However, in other embodiment, theirradiation may be respectively applied from the first substrate 11 andthe second substrate 21, and more than one time for the irradiationprocess can be performed.

As shown in FIG. 1B and FIG. 2, in one preferred embodiment of thepresent invention, when an irradiation is applied from the firstsubstrate 11, the thin film transistor layer 12 (which comprises atleast one patterned metal layer) disposed on the first substrate 11 canbe used as a shielding pattern. More specifically, the patterned metallayer disposed on the first substrate 11 may comprise: circuits (notshown in the figure), the scan lines 121, the data lines 122, and thecapacitor electrode 125. Herein, the region comprising the circuits (notshown in the figure), the scan lines 121, the data lines 122, and thecapacitor electrode 125 can be used as a second region or a shieldingregion of the shielding pattern, and the other region (for example, thepixel electrode 124 or other region of the first substrate without anyunits formed thereon) can be used as a first region or an opening regionof the shielding pattern. The metal layer has relatively lowtransmittance in comparison with the other region, wherein thetransmittance of the metal layer as the second region of the shieldingpattern is about 0˜20%, and that of the first region thereof is about30˜100%. The transmittance of the shielding pattern is differedaccording to the material of the first substrate 11 and the presenceunits formed thereon. Hence, when an irradiation is applied from thefirst substrate 11, the polymerization degrees of the photosensitivemonomers can be differed in the second region (i.e. the shieldingregion) and the first region (i.e. the opening region) by adjusting therelated parameters of the irradiation; and thus the first aggregationlayer 14 and the second aggregation layer 24 having different structurescan be obtained. For example, as shown in FIG. 2 and FIG. 4, when theirradiation is applied from the first substrate 11, the secondaggregation 24 formed on the second substrate 21 may have a patterncomprising a corresponding shielding region 241 and a correspondingopening region 242.

As shown in FIG. 1A and FIG. 3, in one preferred embodiment of thepresent invention, the black matrix layer 221 on the second substrate 21can be used as a shielding pattern when the irradiation is applied fromthe second substrate 21, wherein the black matrix layer 21 comprises ashielding region 2212 (i.e. a second region) and an opening region 2211(i.e. a first region). The shielding region 2212 has relatively lowtransmittance in comparison with the opening region 2211. Herein, theblack matrix layer 221 is used as a shielding pattern, so thetransmittance of the shielding region 2212 (i.e. the second region) isapproximately 0%. The transmittance of the opening region 2211 (i.e. thefirst region) is about 30˜100%, which may be differed according to thematerial of the second substrate 21 and the presence of units formedthereon. When the irradiation is applied from the second substrate 21,the polymerization degrees of the photosensitive monomers can bediffered in the second region (i.e. the shielding region) and the firstregion (i.e. the opening region) by adjusting the related parameters ofthe irradiation; and thus the first aggregation layer 14 and the secondaggregation layer 24 having different structures can be obtained. Forexample, as shown in FIG. 1A and FIG. 5, when the irradiation is appliedfrom the second substrate 21, the first aggregation 14 formed on thefirst substrate 11 may have a pattern comprising a correspondingshielding region 141 and a corresponding opening region 142.

Herein, the corresponding shielding region 141 and the correspondingopening region 142 can be defined with a reflected pattern, which ispreferably obtained with a reflection microscope. The reflected patternis obtained by the different reflections of the corresponding openingregion and the corresponding shielding region while light is irradiatedthereon. In the present embodiment, the light for obtaining thereflected pattern has a wavelength located in a visible region (380nm˜780 nm). However, in other embodiment, the corresponding shieldingregion 141 and the corresponding opening region 142 of the firstaggregation layer 14 can be defined through other methods, for example,the roughness of the aggregation layer.

As shown in FIG. 6 (wherein, the thin film transistor layer and thefirst alignment layer on the first substrate 11, and the secondalignment layer on the second substrate 21 are not shown), a firstaggregation layer 14 comprising a corresponding shielding region 141 anda corresponding opening region 142 is formed on a side of the firstsubstrate 11 facing to the second substrate 21 when the irradiation isapplied from the second substrate 21. Herein, the correspondingshielding region 141 and the corresponding opening region 142respectively correspond to the shielding region 2212 and the openingregion 2211 of the black matrix layer 221 as a shielding patterndisposed on the second substrate 21, and a projection of the openingregion 2211 of the shielding pattern is located in the correspondingopening region 142. In the present embodiment, the black matrix layer221 is one example of the shielding layer, but the shielding layer canbe other metal pattern or other shielding pattern in other embodimentsof the present invention. In the case that a width of the opening region2211 of the shielding pattern is α, a width of the corresponding openingregion 142 of the first aggregation layer 14 is β, and a thickness ofthe liquid crystal layer 31 (also called as a cell gap) is D, α, β and Dsatisfy the following equation (I):0.0002α²+0.9888α+1.637D−4.2987<β<0.0002α²+0.9888α+1.637D+11.5657  (I).

In the present embodiment, the width α of the opening region 2211 of theshielding pattern is 98.72 μm, the distance α′ between two adjacentopening regions 2211 is 52.32 μm, the thickness D of the liquid crystallayer 31 is 3.2 μm, the width β of the corresponding opening region 142of the first aggregation layer 14 is 104.04 μm, and the distance β′between two adjacent corresponding opening regions 142 is 47 μm.However, in other embodiments of the present invention, α, α′, β, β′ andD are not limited to the aforementioned values, as long as theseparameters satisfy the aforementioned equation (I). When theseparameters satisfy the equation (I), the corresponding opening region ofthe first aggregation layer having a predetermined width can be obtainedby controlling the width α of the opening region of the shieldingpattern and the thickness D of the liquid crystal layer.

In addition, as shown in FIG. 6, the first aggregations of the firstaggregation layer 14 are formed in both the corresponding shieldingregion 141 and the corresponding opening region 142 in the presentembodiment. However, in other embodiment, as long as the firstaggregations are formed in the corresponding opening region 142, thefirst aggregations may not be formed in the corresponding shieldingregion 141 since there may be holes or openings formed between theaggregations of the aggregation layer. In this case, a part of the firstsubstrate 11 and some units formed thereon may be exposed from thecorresponding shielding region 141.

Furthermore, as shown in FIG. 7, when the irradiation is applied fromthe second substrate 21, not only the first aggregation layer 14 isformed on the first substrate 11, but also the second aggregation layer24 is formed on a side of the second substrate 21 facing to the firstsubstrate 11. Herein, the second aggregation layer 24 also comprises acorresponding shielding region 241 and a corresponding opening region242, which respectively correspond to the shielding region 2212 and theopening region 2211 of the black matrix layer 221 as the shieldingpattern on the second substrate 21.

In the present embodiment, the roughness of the first aggregation layer14 and the second aggregation layer 24, which can facilitate the tilt ofthe liquid crystal molecules when operating the liquid crystal displaypanel, can be adjusted by controlling the focus, the energy and theirradiating time of the irradiation. Preferably, as shown in FIG. 6 andFIG. 7, the roughness of the corresponding opening region 142 of thefirst aggregation layer 14 is larger than that of the correspondingshielding region 141 thereof; and/or the roughness of the correspondingopening region 242 of the second aggregation layer 24 is larger thanthat of the corresponding shielding region 241 thereof. In addition, theroughness of the corresponding opening region 142 of the firstaggregation layer 14 is preferably larger than that of the correspondingopening region 242 of the second aggregation layer 24. More preferably,the roughness of the corresponding opening region 142 of the firstaggregation layer 14 or the corresponding opening region 242 of thesecond aggregation layer 24 is 5˜12 times of that of the correspondingshielding region 141 and the corresponding shielding region 241. Herein,the term “roughness” refers to Root Mean Square (RMS) roughness (Rq),which is the RMS average between the height deviations and the centralline along a longitude of the sample (i.e. the first aggregation layeror the second aggregation layer).

As shown in FIG. 7, in the present embodiment, the roughness of thecorresponding opening region 142 of the first aggregation layer 14 isabout 24.8 nm, and the corresponding shielding region 141 thereof isabout 3.37 nm. The roughness of the corresponding opening region 242 ofthe second aggregation layer 24 is about 18 nm, and the correspondingshielding region 241 thereof is about 2.46 nm. However, in otherembodiment, the roughness of the first aggregation layer 14 and thesecond aggregation layer 24 is not limited thereto. As long as theroughness of the corresponding opening regions and the correspondingshielding regions of the first aggregation layer and the secondaggregation layer satisfy the aforementioned relations, the purpose offacilitating the tilts of the liquid crystal molecules during theoperation of the liquid crystal display panel can be achieved.

Furthermore, as shown in FIG. 7, the first aggregation layer 14 and thesecond aggregation layer 24 can be adjusted to have various heights indifferent regions by controlling the focus, the energy and theirradiating time of the irradiation. For example, the average heightbetween a surface of the corresponding opening region 142 of the firstaggregation layer 14 and a surface 131 of a first alignment layer 13 onthe first substrate 11 is at least 15 nm larger than that between asurface of the corresponding shielding region 141 thereof and thesurface 131, i.e. ΔH=(H1−H2)≥15 nm. Preferably, the aforementionedaverage height difference is 15˜100 nm (100 nm≥ΔH=(H1−H2)≥15 nm); andmore preferably, the aforementioned average height difference is 20˜50nm (50 nm≥ΔH=(H1−H2)≥20 nm).

FIGS. 8 to 10 are enlarged views of first aggregation layers of liquidcrystal display panels indicated by the region R shown in FIG. 6,wherein the horizontal lines indicate the average height of thecorresponding shielding region 141 and the corresponding opening region142, the unit of the X-axis is μm, and the unit of the Y-axis is nm. Asshown in FIGS. 8 to 10, the first aggregation layer may have differentstructures in the liquid display panels of different embodiments, andthere is a height difference ΔH between the corresponding shieldingregion 141 and the corresponding opening region 142. The heightdifference ΔH is at least 15 nm, preferably 15˜100 nm, and morepreferably 20˜50 nm.

In conclusion, when an irradiation is applied from a second substrateduring the process for manufacturing a liquid crystal display panel ofthe present invention, the opening region of the black matrix layer canfacilitate the polymerization of the photosensitive monomers. In theconventional display panel, the opening region of the black matrix layermay cause light leakage. However, in the liquid crystal display panel ofthe present invention, the corresponding opening region of the firstaggregation layer opposite to the opening region of the black matrixlayer has relative large roughness, and the increased roughness of thecorresponding opening region can facilitate the tilt of the liquidcrystal molecules. Hence, the tilt of the liquid crystal molecules canrecover rapidly after a voltage is applied thereto during the operationof the liquid crystal display panel, and thus the light leakage can beprevented. In addition, in order to obtain better orientation of liquidcrystal molecules, no additional voltage is applied to the non-displayregion during the polymerization process, so an improved verticalalignment of the liquid crystal molecules in the non-display region canbe achieved. Thus, the liquid crystal molecules in the non-displayregion can recover more quickly when an external voltage is applied ontothe liquid crystal panel. In addition, during the polymerizationprocess, an additional voltage is applied to the display region to makethe liquid crystal molecules in the liquid crystal layer tilt in apredetermined angle, and thus the bright state and the dark state of thedisplay panel can be exchanged rapidly.

Herein, only the display panel shown in FIG. 1A is illustrated indetail. For a person skilled in the art, the aggregation layer of thedisplay panel shown in FIG. 1B also have the aforementionedcharacteristics.

Furthermore, the display device provided by the present invention can beapplied to any electronic device for displaying images, such as a mobilephone, a notebook, a camera, a video camera, a music player, anavigation system, or a television.

Although the present invention has been explained in relation to itspreferred embodiment, it is to be understood that many other possiblemodifications and variations can be made without departing from thespirit and scope of the invention as hereinafter claimed.

What is claimed is:
 1. A display panel, comprising: a first substrate; asecond substrate opposite to the first substrate; a liquid crystal layerdisposed between the first substrate and the second substrate; ashielding pattern disposed on the second substrate and defining a firstregion and a second region, wherein a transmittance of the first regionis larger than a transmittance of the second region; a first polymerlayer in contact with the liquid crystal layer and disposed on a side ofthe first substrate facing to the second substrate, wherein a roughnessof the first polymer layer corresponding to the first region is largerthan a roughness of the first polymer layer corresponding to the secondregion; and a second polymer layer in contact with the liquid crystallayer and disposed on a side of the second substrate facing to the firstsubstrate, wherein a roughness of the second polymer layer correspondingto the first region is larger than a roughness of the second polymerlayer corresponding to the second region.
 2. The display panel asclaimed in claim 1, wherein the transmittance of the first region isbetween 30 and 100%, or the transmittance of the second region isbetween 0 and 20%.
 3. The display panel as claimed in claim 1, whereinthe first region corresponds to an opening region, and the second regioncorresponds to a shielding region.
 4. The display panel as claimed inclaim 1, wherein the shielding pattern is a black matrix layer or apatterned metal layer.
 5. The display panel as claimed in claim 1,wherein the roughness of the first polymer layer corresponding to thefirst region is larger than the roughness of the second polymer layercorresponding to the first region.
 6. The display panel as claimed inclaim 5, wherein the roughness of the first polymer layer or the secondpolymer layer corresponding to the first region is 5 to 12 times of theroughness of the second polymer layer corresponding to the secondregion.
 7. The display panel as claimed in claim 1, wherein the firstpolymer layer comprises a corresponding opening region and acorresponding shielding region, the corresponding opening region and thecorresponding shielding region respectively correspond to the firstregion and the second region, a width of the first region is α, a widthof the corresponding opening region of the first polymer layer is β, athickness of the liquid crystal layer is D, and values of α,β and Dsatisfy the following equation (I):0. 0002α²+0.9888α+1.637D−4.2987<β<0.0002α²+0.9888α+1.637D+11.5657  (I),wherein the units of α,β and D are in micrometer.